Redundant vs Tautology - What's the difference?
As a adjective redundant
is superfluous; exceeding what is necessary.
As a noun tautology is
(uncountable) redundant use of words.
Superfluous; exceeding what is necessary.
Repetitive or needlessly wordy.
(chiefly, British) Dismissed from employment because no longer needed; as in "rendered redundant".
Duplicating or able to duplicate the function of another component of a system, providing back-up in the event the other component fails.
* 2013 , Tom Denton, Automobile Electrical and Electronic Systems , page 142:
- The two lines are mainly used for redundant and therefore fault-tolerant message transmission, but they can also transmit different messages.
(uncountable) redundant use of words
(countable) An expression that features tautology.
- It is tautology to say, "Forward Planning".
* 1946 , Bertrand Russell, History of Western Philosophy :
- ''The expression "raze to the ground" is a tautology, since the word "raze" includes the notion "to the ground".
(countable, logic) A statement that is true for all values of its variables
- Pure mathematics consists of tautologies , analogous to ‘men are men’, but usually more complicated.
- Given a Boolean A, "A OR (NOT A)" is a tautology .
- A logical statement which is neither a tautology nor a contradiction is a contingency.
- A tautology''' can be verified by constructing a truth tree for its negation: if all of the leaf nodes of such truth tree end in X's, then the original (pre-negated) formula is a '''tautology .
* contradiction in terms
* (in logic) contradiction
* (literary) oxymoron
* (in logic) contingency, contradiction